A Double Interpolation and Mutation Interval Reconstruction LMD and Its Application in Fault Diagnosis of Reciprocating Compressor

Abstract

The accuracy and stability of the envelope estimation function are enduring issues throughout the research process of LMD. This paper presents double interpolation and mutation interval reconstruction local mean decomposition (DIMIRLMD) to improve the stability of the demodulation process and the accuracy of PF components. DIMIRLMD first proposes a mutation interval reconstruction envelope algorithm using extreme symmetry points to suppress the demodulation mutation phenomenon, which disturbs the stability of the demodulation process, and then selects the optimal PF component from a double interpolation PF component library based on the index of orthogonality (IO) for a better hierarchical property. DIMIRLMD was employed to analyze the simulation signal and vibration signal of a reciprocating compressor in an oversized bearing clearance state, and the results illustrate its performances are more excellent than those of three other LMD methods. Furthermore, the envelope frequency spectrum obtained from the proposed LMD presents a clear double rotation fault frequency and lower noise disturbance.

Experimental Study on the Identification and Diagnosis of Dynamic Crack Propagation in the Piston Rods of Process Gas Compressors in Underground Gas Storage

“…Finally, considering the inclusion of crack growth produces high-frequency signals of short duration and high amplitude. After obtaining the signal envelope for one cycle, the impulse factor is calculated by Equations ( 8)- (10) to reflect the mutations in the signal and identify the crack.…”

“…However, the use of reciprocating compressors presents challenges associated with unplanned downtime and significant maintenance costs. These challenges stem primarily from the frequent and abrupt nature of core component failures, including failures such as valve leakage and fractures [8,9], bearing bush wear issues [10,11], and piston rod fractures [12]. In particular, piston rod fractures account for a significant proportion of mechanical failures in reciprocating compressors, estimated at around a quarter of reported incidents [13].…”

High-Dimensional Mapping Entropy Method and Its Application in the Fault Diagnosis of Reciprocating Compressors

“…It is imperative to conduct equipment monitoring, maintenance, and fault research which ensure the smooth operation of these compressors [1]. The vibration signals of reciprocating compressors exhibit strong non-stationary characteristics and multi-component coupling characteristics due to their complex structures and multiple excitations [2]. The inherent structural characteristics of reciprocating compressors result in vibration signals that encapsulate the vibrational attributes of various components, rendering the identification of fault characteristics challenging [3].…”

Control Strategies for Piston Trajectory in Ionic Compressors for Hydrogen Storage

“…Expanding the storage pressure of hydrogen by compressing it is an effective solution for increasing its volumetric energy density [10]. Commonly utilized technologies for compressing hydrogen consist of reciprocating piston compressors [11], diaphragm compressors, linear compressors, metal hydride compressors [12], and ionic liquid compressors [13].…”